The word 'wiggler' is a transparent Modern English compound built from the verb 'wiggle' and the agentive suffix '-er'. The verb 'wiggle' itself has a playful, imitative quality, likely originating from Middle Low German or Middle Dutch roots describing a wobbling or swaying motion. The suffix '-er' is one of the most productive in English, directly inherited from the Old English agent noun ending -ere. Therefore, a 'wiggler' is, quite logically, "one who wiggles," a meaning that applies literally to a fidgeting child or, by zoological extension, to the characteristically wriggling aquatic larva of a mosquito.

Structure: wiggle (to move with short, quick movements) + er (one who or that which does something) - wiggle: From Middle English wiglen, of Low German or Dutch origin (e.g., Middle Low German wiggelen), related to the concept of moving back and forth. Its functional role is the core verb/action. - er: A native English agent noun suffix from Old English -ere, of Germanic origin, used to form nouns denoting a person or thing that performs the action of the verb.